KR100838754B1 - Fixing structure for retainer of camera module - Google Patents

Abstract

The present invention relates to a fixing structure of a retainer mounted to a camera module.

A housing in which the cylindrical body is integrally formed; A printed circuit board that is tightly coupled to a lower portion of the housing and has an image sensor mounted on a central portion thereof; A lens barrel inserted into the cylindrical body of the housing and having at least one or more hooks stacked therein and having at least two hooks thereon; And a retainer mounted to an upper end of the lens barrel and having a hook coupler formed at a point corresponding to the hook, wherein the hook protruding upward from the upper end of the lens barrel is inserted into the hook coupler provided in the retainer. The lens barrel and the retainer is characterized in that the integrally coupled.

Housing, Printed Circuit Board, Lens Barrel, Hook, Elastic Support, Retainer, Hook Joint, IR Filter

Description

Fixing structure for retainer of camera module}

1 is an assembled perspective view showing a state of assembly of a conventional COF camera module.

2 is a cross-sectional view of a part of the conventional COF-type camera module cut.

Figure 3 is a schematic cross-sectional view of a conventional COB type camera module.

Figure 4 is an exploded perspective view of a conventional COB camera module.

Figure 5 is an assembled perspective view of a conventional camera module separated retainer.

Figure 6 is an assembled perspective view of the camera module shown retainer fixing structure according to the present invention.

7 is a cross-sectional view of the camera module according to the present invention.

FIG. 8 is an enlarged sectional view taken on line “A” of FIG. 7;

<Explanation of symbols for the main parts of the drawings>

110. Housing 120. Printed Circuit Board

130. Lens Barrel 135. Hook

136. Elastic Supports 140. Retainers

141. Hook Coupler 150. IR Filter

The present invention relates to a retainer fixing structure, and more particularly, to a retainer fixing structure of a camera module to prevent the optical axis distortion of the camera module as the retainer is vertically coupled to the upper portion of the lens barrel by the fitting by the hook. It is about.

Currently, portable terminals such as mobile phones and PDAs have recently been used as multi-function multi devices equipped with music, movie, TV, and game functions as well as simple telephone functions with the development of the technology.

The camera module may be a representative one of leading the multifunctionalization of the portable terminal, and the camera module is changed from the existing 300,000 pixels (VGA level) to the high pixel center of 8 million pixels or more at the same time. The implementation of various additional functions such as auto focusing (AF) and optical zoom is changing.

In general, a compact camera module (CCM) is a small size and is applied to various IT devices such as a camera phone, a PDA, a smart phone, and a portable mobile communication device. The market is gradually increasing the number of devices equipped with camera modules.

Such a camera module is manufactured using an image sensor such as a CCD or a CMOS as a main component, and collects an image of an object through the image sensor and stores it as data in a memory in the device, and the stored data is stored in the LCD or PC in the device. The image is displayed through a display medium such as a monitor.

A typical camera module is typically manufactured by a method such as a chip on board (COB), a chip on flexible (COF), and the brief structure with reference to the drawings shown below.

1 is an assembled perspective view illustrating a state of assembling a camera module of a conventional COF method, and FIG. 2 is a cross-sectional view of a part of the camera module of a conventional COF method.

As shown in the drawing, the conventional camera module 1 includes a housing 2 in which an image sensor 3 for converting an image signal input through a lens into an electrical signal is supported on a bottom thereof, and the image sensor 3 of the subject. The lens group 4 for collecting the video signal and the barrel 5 in which the lens group 4 is stacked in multiple stages are constituted by a sequential combination.

At this time, a mounting substrate (FPCB) 6 having a capacitor and a chip component of resistance, which is an electrical component for driving the image sensor 3 made of CCD or CMOS, is attached to the lower portion of the housing 2. ) Is electrically coupled.

The conventional camera module 1 configured as described above has an anisotropic conductive film (ACF) between the substrate 6 and the image sensor 3 in a state where a plurality of circuit components are mounted on the mounting substrate FPCB 6. Flim) (8) is inserted and adhesively fixed so that it is energized by applying heat and pressure, and the IR filter (7) is attached to the opposite side.

Further, as described above in the state in which the barrel 5 in which the plurality of lens groups 4 are built and the housing 2 are temporarily coupled by screwing, the pre-assembled mounting substrate 6 is placed on the bottom of the housing. It is adhesively fixed by a separate adhesive.

On the other hand, after fixing the mounting substrate 6 to which the image sensor 3 is attached and the housing 2 to which the barrel 5 is coupled, the subject (resolution chart) is placed at a predetermined distance in front of the barrel 5. The focus adjustment of the camera module 1 is performed by adjusting the vertical feed amount by the rotation of the barrel 5 screwed to the housing 2, thereby adjusting the lens group 4 and the image sensor ( 3) focusing is performed.

In this case, the distance of the subject is approximately 50 cm at an infinite distance from the focus adjustment is made, and after the final focus is adjusted by injecting an adhesive between the housing 2 and the barrel 5 in the focused state Adhesive is fixed.

However, in order to adjust the focus of the image on which the barrel 5 on which the lens group 4 is mounted is assembled with the housing 2 and the image sensor 3, the barrel 5 screwed to the housing 2 is left. When the roller is rotated and vertically transferred, foreign substances such as particles generated by friction between the screw coupling portion of the housing 2 and the barrel 5 fall to the upper surface of the IR filter 7 or the image sensor 3. There is a disadvantage in that a foreign material defect occurs as it is exposed on the light receiving area of the image sensor 3.

In addition, an assembly criterion of the mounting substrate 6 and the housing 2 is determined by the IR filter 7, and the IR filter 7 forms the center of the image sensor 3 and the lens group 4. It plays an important role, and has a great influence on the foreign matter depending on the mounting position of the IR filter (7).

That is, the closer the mounting position of the IR filter 7 is to the image sensor 3, the more foreign matter dropped on the upper surface of the IR filter 7 is easily recognized, and conversely, the farther the IR filter 7 is from the image sensor 3. As the influence on the foreign material becomes less sensitive, a camera module design is required to properly maintain the distance between the IR filter 7 and the image sensor 3.

On the other hand, Figure 3 and Figure 4 is a view showing a camera module manufactured in a COB method, Figure 3 is a schematic cross-sectional view of a conventional COB type camera module, Figure 4 is an exploded perspective view of a conventional COB type camera module In the conventional camera module 10, the printed circuit board 11 having the CCD or CMOS image sensor 12 mounted by wire bonding is coupled to the bottom of the plastic housing 13 and the top of the housing 13. It is manufactured by the lens barrel 16 is coupled to the cylindrical body 15 is extended to the lower barrel 14 to extend.

The camera module 10 has a housing 13 and a lens barrel 16 formed by screwing a female screw portion 14a formed on the inner circumferential surface of the barrel 14 and a male screw portion 15a formed on the outer circumferential surface of the cylindrical body 15. Combined.

In this case, an IR filter 18 is disposed between the upper surface of the printed board 11, that is, the lens L mounted on the lower end of the lens barrel 16 and the image sensor 12 attached to the lower surface of the printed board 11. By being combined, the infrared rays of excessive long wavelength flowing into the image sensor 12 are blocked.

In the camera module assembled as described above, light flowing from a specific object passes through the lens L and the image is inverted to focus on the surface of the image sensor 12. While rotating the lens barrel 16, the adhesive is injected into the gap between the housing 13 and the lens barrel 16 at the point where the optimum focus is achieved, and the housing 13 and the lens barrel 16 are adhesively fixed to the end. Camera module products are produced.

As described above, two types of camera module assembly methods (COB and COF) have a cover-type retainer mounted on an upper end of the lens barrels 5 and 16 that are coupled to the upper portions of the housings 2 and 13. As shown in FIG. 5 shown below, the mounting structure of the conventional camera module 20 is the same as the coupling structure of the lens barrel 21 and the housing 22 of the lens barrel 21 and the retainer 23. It is made of screwed structure.

Accordingly, the male screw portion 21a is provided at the upper end of the lens barrel 21 so as to correspond to the female screw portion (not shown) formed on the inner circumferential surface of the retainer 23.

However, the screw coupling of the lens barrel 21 and the retainer 23 has a disadvantage in that it is difficult to gradually tighten as the miniaturization and slimming of the camera module 20 proceed, and the lens barrel of the camera module aiming for light and thin end digestion ( 21) It is pointed out that the machining of the threaded part on the upper circumferential surface is quite difficult.

In addition, when the retainer 23 is screwed to the conventional lens barrel 21, there is a disadvantage in that the optical axis is distorted due to the inclination angle of the screw line.

Therefore, the present invention was devised to solve the above-mentioned disadvantages and problems in the conventional camera module, and a pair of hooks protrude from the lens barrel in which a plurality of lenses are stacked and coupled therein, and the hooks are formed. It is an object of the present invention to provide a retainer fixing structure of a camera module through which the retainer is elastically coupled at the upper portion of the lens barrel, so that the retainer can be easily coupled without distortion of the optical axis.

The object of the present invention is a housing in which a printed circuit board is mounted in close contact with the image sensor is mounted in the center portion, the lens barrel is vertically coupled to the upper portion of the housing, a plurality of hooks protrude upwardly at the upper end, A retainer fixing structure of a camera module including a retainer elastically coupled to a hook on an upper portion of a lens barrel is provided.

The lens barrel has a cylindrical shape and at least one lens is stacked and coupled therein, and a plurality of hooks protrude upward from the cylindrical outer peripheral edge of the cylindrical barrel.

The hook is preferably formed at least two protruding portion of the upper end of the lens barrel, it is inserted in close contact in the hook coupling hole formed in the retainer mounted on the upper portion of the lens barrel.

Therefore, the lens barrel and the retainer are integrally coupled by hook mounting, and the lower end of the lens barrel is vertically coupled to the upper end of the housing by the rotation of the retainer while the retainer is mounted on the upper end, thereby forming an optical unit. .

On the other hand, the inside of the housing is embedded with an infrared blocking member for blocking the infrared rays included in the light incident vertically through the lens in the lens barrel mounted on the upper portion, the lower portion of the printed circuit board mounted with the image sensor in the center This is tightly coupled.

Matters relating to the operational effects including the technical configuration for the above object of the retainer fixing structure of the camera module according to the present invention will be clearly understood by the following detailed description with reference to the drawings in which preferred embodiments of the present invention are shown.

First, FIG. 6 is an assembled perspective view of a camera module showing a retainer fixing structure according to the present invention, FIG. 7 is a sectional view of the camera module according to the present invention, and FIG. 8 is an enlarged sectional view of "A" of FIG.

As shown, the camera module 100 of the present invention is a housing 110, a printed circuit board 120 coupled to the lower portion of the housing 110, the housing 112 is mounted on the upper end and retainer 140 is composed of a lens barrel 130 coupled.

The housing 110 is provided with a stepped portion 111 supporting a lower end of the lens barrel 130 at an arbitrary point therein, and a female screw portion 112 is provided on the upper inner circumferential surface of the cylindrical body 130 extending upward. .

The housing 110 has a printed circuit board 120 in which the image sensor 121 is mounted at the center thereof in close contact with the housing 110, and has a cylindrical lens barrel 130 inside the cylindrical body 110 ′ of the housing 110. Is inserted.

The lens barrel 130 has at least one lens (L) is laminated and coupled to the inside and at the same time the bottom inner peripheral surface of the glass or film-type IR filter 150 is built in the lower peripheral portion of the housing 110 in the stepped portion The contact is supported on the 111, the male screw portion 131 is formed on the outer circumferential surface of the lens barrel 130, when the insert into the housing 110, the female screw 112 and the close coupling of the inner circumferential surface by screw coupling do.

In addition, the lens barrel 130 has a plurality of hooks 135 protruding upward on the upper periphery.

At least two or more hooks 135 of the lens barrel 130 are protruded from each other by being symmetrical with each other, and a resilient support 136 formed in the form of a groove in the center is provided with a predetermined elasticity.

The hook 135 is preferably supported by three points on the lower portion of the hook 135 to enable stable elastic support of the retainer 140 coupled to the upper end of the cylindrical lens barrel 130. Therefore, it is most preferable that three hooks 135 protruding from the upper end of the lens barrel 130 are formed at equal intervals on the upper outer periphery thereof.

On the other hand, the retainer 140 is coupled to the upper portion of the lens barrel 130 has a hook coupling hole 141 is formed at a position corresponding to the hook 135, the upper end of the hook 135 is elastically inserted and fixed .

The retainer 140 has a separate focusing lens or a lens protective glass G coupled to a central portion thereof and is vertically mounted at the upper portion of the lens barrel 130. The upper end of the hook 135 has a hook coupling hole 141. ) Closely fixed by interference fit inside.

At this time, the inclined surface 137 formed at the upper end of the hook 135 is in close contact with the guide surface 142 formed at the lower side of the hook coupling hole 141, that is, the opening side for coupling the hook 135 elastically close Combined.

As such, the cylindrical lens barrel 130 to which the retainer 140 is coupled is inserted into the cylindrical body 110 ′ of the housing 110, and a female screw part formed on an inner circumferential surface of the cylindrical body 110 ′. It is vertically mounted on the housing 110 by a screw coupling of the male portion 131 formed on the outer peripheral surface of the lens barrel 130 and 112.

Here, the lens barrel 130 mounted on the housing 110 is manually coupled by rotating the retainer 140 tightly fixed to the upper portion.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and various substitutions, modifications, and changes within the scope without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It will be possible, but such substitutions, changes and the like should be regarded as belonging to the following claims.

As described above, the retainer fixing structure of the camera module according to the present invention is such that the retainer is elastically coupled to the upper portion of the lens barrel through a hook protruding above the lens barrel, so that the retainer is directly on the barrel without twisting the optical axis. It can be mounted, there is an advantage that can facilitate the camera module manufacturing process because it can avoid the screw processing of the lens barrel and retainer.

Claims (7)

A housing in which the cylindrical body is integrally formed; A printed circuit board that is tightly coupled to a lower portion of the housing and has an image sensor mounted on a central portion thereof; A lens barrel inserted into the cylindrical body of the housing and having at least one or more hooks stacked therein and having at least two hooks thereon; And It is mounted to the upper end of the lens barrel, and includes a retainer formed with a hook coupler at a point corresponding to the hook, The camera module, characterized in that the lens barrel and the retainer is integrally coupled by inserting the hook protruding upward from the upper end of the lens barrel into the hook coupling hole provided in the retainer. The method of claim 1, The housing, the camera module, characterized in that the stepped portion provided with a lower end of the lens barrel at any point therein. The method of claim 1, The hook and the hook coupler is a camera module, characterized in that closely coupled by interference fit. The method of claim 1, The lens barrel is a camera module, characterized in that the lower portion of the infrared ray blocking member of the glass or film form is mounted. The method of claim 2, The hook is a camera module, characterized in that provided with an elastic support portion formed in the form of a groove in the center portion to be elastically coupled to the hook coupling hole of the retainer. The method of claim 1, The lens barrel is a camera module, characterized in that the male screw portion is formed on the outer peripheral surface is inserted and fixed by screwing with the female screw portion of the inner peripheral surface of the housing. The method of claim 2, The hook is a camera module, characterized in that the inclined surface is formed in the upper end, the inclined surface is elastically tightly coupled while contacting the guide surface formed on one side of the opening of the lower side of the hook coupler.

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